Correct Answer:
A. The bi-metallic strip bends in response to temperature changes, and this bending movement operates a mechanical pointer or switch to indicate the temperature.
Explanation:
- A. Correct: Bi-metallic strips consist of two different metals bonded together. When the temperature changes, the metals expand or contract at different rates, causing the strip to bend. This bending can move a mechanical pointer or operate a switch, providing a direct temperature indication.
- B. Incorrect: Bi-metallic strips do not generate an electrical signal. They rely on mechanical bending to measure temperature, rather than producing an electrical output.
- C. Incorrect: Bi-metallic strips do not change color with temperature. They function based on physical bending rather than color change.
- D. Incorrect: Bi-metallic strips do not measure temperature by changing thermal conductivity. They use mechanical deformation due to different thermal expansion rates of the metals involved.
Correct Answer:
A. The bi-metallic strip bends in response to temperature changes, and this bending movement operates a mechanical pointer or switch to indicate the temperature.
Explanation:
- A. Correct: Bi-metallic strips consist of two different metals bonded together. When the temperature changes, the metals expand or contract at different rates, causing the strip to bend. This bending can move a mechanical pointer or operate a switch, providing a direct temperature indication.
- B. Incorrect: Bi-metallic strips do not generate an electrical signal. They rely on mechanical bending to measure temperature, rather than producing an electrical output.
- C. Incorrect: Bi-metallic strips do not change color with temperature. They function based on physical bending rather than color change.
- D. Incorrect: Bi-metallic strips do not measure temperature by changing thermal conductivity. They use mechanical deformation due to different thermal expansion rates of the metals involved.